code: def invert(grads):
      """Inverts the gradients.
  
      Args:
          grads: A numpy array of grads to use.
  
      Returns:
          The inverted gradients.
      """
      return 1.0 / (grads + K.epsilon())
  
file_path: keras-vis/vis/grad_modifiers.py
imports: from __future__ import absolute_import
  import numpy
  from keras import backend
  from .utils import utils
label_desc: Use image node_id 3 for calling a global function with example usage: invert(grads) and returns: unknown